Decays of Roper-like singly heavy baryons in a chiral model

Abstract

We present a chiral model describing decays of the Roper-like ${\Lambda }_c(2765)$ and ${\Xi }_c(2970)$ as well as those of the heavy quark spin-doublet $\{{\Sigma }_c(2455),{\Sigma }_c(2520)\}$ and $\{{\Xi }_c^{\prime },{\Xi }_c(2645)\}$, by focusing on chiral representations of diquarks inside the heavy baryons. Based on our chiral model together with the heavy quark spin symmetry, we derive a relation satisfied by axial charges of the heavy baryons that controls magnitude of their one pion (kaon) decays. Besides, it is shown that the large decay widths of the Roper-like ${\Lambda }_c(2765)$ and ${\Xi }_c(2970)$, which cannot be implemented by conventional non-relativistic quark models, are explained by reasonable values of the axial charges. In addition, we apply the chiral model to bottom baryons and predict decay widths of the undiscovered Roper-like ${\Xi }_b$. We expect that our present investigation leads to elucidation of dynamical properties of the excited heavy baryons from the viewpoint of chiral symmetry.

12 pages, 7 figures, and 4 tables

References in corpus (4)

• Low-lying charmed and charmed-strange baryon states
• Structure of charmed baryons studied by pionic decays
• Single heavy baryons with chiral partner structure in a three-flavor chiral model
• Suppression of decay widths in singly heavy baryons induced by the $U_A(1)$ anomaly

Cited by in corpus (1)

• Axial anomaly effect on three-quark and five-quark singly heavy baryons